Foreword: This volume contains the proceedings of the Ninth International Conference on Enterprise Information Systems (ICEIS 2007) organized by the Institute for Systems and Technologies of Information Control and Communication (INSTICC) and the University of Madeira, in collaboration with ACM/SIGMIS and AAAI. Furthermore, the conference was sponsored by the Portuguese Foundation for Science and Technology (FCT). ICEIS has become a major point of contact between research scientists, engineers and practitioners in the area of business applications of information systems. This year, five simultaneous tracks were held, covering different aspects related to enterprise computing, including: “Databases and Information Systems Integration”, “Artificial Intelligence and Decision Support Systems”, “Information Systems Analysis and Specification”, “Software Agents and Internet Computing” and “Human-Computer Interaction”. All tracks describe research work that is often oriented towards real world applications and highlight the benefits of Information Systems and Technology for industry and services, thus making a bridge between the Academia and the Enterprise worlds. Following the success of 2006, ICEIS 2007 also had a number of satellite workshops, related to the field of the conference. This year we collaborated in the organization of the following ten international workshops: 7th International Workshop on Pattern Recognition in Information Systems; 1st International Joint Workshop on Wireless Ubiquitous Computing; 5th International Workshop on Modelling, Simulation, Verification and Validation of Enterprise Information Systems; 5th International Workshop on Security In Information Systems; 4th International Workshop on Natural Language Processing and Cognitive Science; 4th International Workshop on Computer Supported Activity Coordination; 3rd International Workshop on Model-Driven Enterprise Information Systems; 1st International Joint Workshop on Technologies for Collaborative Business Processes and Management of Enterprise Information Systems; 1st International Workshop on RFID Technology - Concepts, Applications, Challenges and 1st International Workshop on Human Resource Information Systems. This year, ICEIS 2007 received 644 paper submissions from more than 40 countries in all continents. 72 papers were published and presented as full papers, i.e. completed work (8 pages/30’ oral presentation), 198 papers reflecting work-in-progress or position papers were accepted for short presentation, and another 131 contributions were scheduled for poster presentation. These numbers, leading to a “full-paper” acceptance ratio below 12%, and a total acceptance ratio below 65%, show the intention of preserving a high quality forum for the next editions of this conference. Additionally, as usual in the ICEIS conference series, a number of invited talks, presented by internationally recognized specialists in different areas, have positively contributed to reinforce the overall quality of the Conference and to provide a deeper understanding of the Enterprise Information Systems field. A book of Selected Papers will be published, following the conference, by Springer in the newly created series ”Lecture Notes in Business Information Processing“ (LNBIP). This series brings the successful LNCS approach to areas such as business information systems, e-business, B2B integration, Enterprise applications and industrial software development. The program for this conference required the dedicated effort of many people. Firstly, we must thank the authors, whose research and development efforts are recorded here. Secondly, we thank the members of the program committee and the additional reviewers for their diligence and expert reviewing. Thirdly, we thank the invited speakers for their invaluable contribution and for taking the time to synthesise and prepare their talks. Fourthly, we thank the workshop chairs and the special session chairs whose collaboration with ICEIS was much appreciated. Finally, special thanks to all the members of the local organising committee, especially Jorge Cardoso, whose collaboration was fundamental for the success of this conference. This year, the organization will distribute two awards to papers presented at the conference: the best paper award and the best student paper award, mainly based on the classifications provided by the Program Committee members. We wish you all an exciting conference and an unforgettable stay in the lovely island of Madeira. We hope to meet you again next year for the 10th ICEIS, to be held in Barcelona - Spain, details of which are available at http://www.iceis.org.(More)